Open your phone to non-market apps..

With a few exceptions, most Android phones give you the option to allow non-Market apps on your phone. That means you can download third-party software like Amazon’s Appstore or apps you find online. To enable the feature go to Settings > Applications Settings and check the box next to “Unknown sources.”

Keep in mind that this leaves your phone vulnerable to malware, so don’t download apps from sources you don’t trust.